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From: Lawrence D'Oliveiro <ldo@nz.invalid>
Newsgroups: comp.os.vms
Subject: Re: Can C #includes like this be made to work on VMS?
Date: Wed, 16 Oct 2024 23:00:14 -0000 (UTC)
Organization: A noiseless patient Spider
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On Wed, 16 Oct 2024 18:44:44 -0400, Arne Vajhøj wrote:

> procedure eve_all_replace(fndstr,rplstr)
> local fnd_string,
>        rpl_string, pos_mark, count_integer;
> if not (eve$prompt_string(fndstr,fnd_string,"Old string: ",
>                            "No old string given")) then
>      return;

When DEC introduced TPU/EVE, I raised my arms to the heavens in joy at 
finally being liberated from the suffering that was EDT. (Hate EDT. Hate, 
hate, hate.)

Then I left it behind with VMS ... and a few decades later, finally found 
the time to get to grips with Emacs.

In Emacs/ELisp, there is the distinction between a “function” (what TPU 
would call a “procedure”, I guess) and a “command”. A “function” only 
becomes a “command” when you insert the “(interactive ...)” directive near 
its start. This is a declarative construct that supplies the information 
Emacs uses to obtain the right arguments for the function automatically, 
including prompting the user as necessary, so your code doesn’t have to.